The Process Church of the Final Judgment was an occult group
that was rumoured to be linked in some way with both the
Son of Sam cult killings in NY, 1977, as well as the Charles
Manson cult murders.

"The Process, as noted earlier, preached the alliance of
the lamb of Christ and the goat of Satan. Illustrations of
the lamb [white triangle] and goat [black
triangle] joined together [blackwhite, i.e., Seal of
Solomon] appeared in their magazines."
(Terry, page 381 [Brackets mine]) "Master black magician,
Aleister Crowley, who died in 1947, had written about the
unification of God and Satan", noted Maury Terry,
author of The Ultimate Evil, a book about the
Son of Sam
cult killings, page 218.) This process of
yoking good and evil is symbolized by Solomon's Seal, and
Crowley, a master magician of the Qabalah, no doubt understood
this. (See "The
Eschatology of Solomon's Seal".)